Other players on Reddit report having encountered the same problem with several other games, such as Rune Factory Oceans, Super Street Fighter IV: Arcade Edition, or Gex: Enter the Gecko. Even, for some unfortunates, their entire digital library.
Several solutions have been shared online, such as re-downloading games, subscribing or unsubscribing from PlayStation Plus, or resetting the console, but nothing seems to work so far. And on the side of Sony, nothing has yet been announced.
On the side of Kotakuit is noted that the concern may stem from an issue that caused the PS Vita and PS3 to revert game license expiration dates back to the Unix era, either to an arbitrary time and date set by developers to designate the beginning of a console’s life.
But the arrival of a new PlayStation Plus formula might also explain this technical bug.